Optimal Neutral Point Voltage Balancing Algorithm for Three-phase Three-level Converters with Hybrid Zero-sequence Signal Injection and Virtual Zero-level Modulation

Jun Wang, Xibo Yuan*, Kfir J Dagan, Andrew Bloor

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

34 Downloads (Pure)

Abstract

This paper presents an optimal carrier-based voltage balancing scheme for three-phase, three-level converters. The proposed scheme utilizes two available degrees of freedom, i.e. Zero-sequence Signal Injection (ZSI) and Virtual Zero-level Modulation (VZM), to eliminate the low-frequency neutral point voltage oscillation. It is universally effective over the full power factor and modulation index range and easy to implement in digital controllers. The hybrid algorithm combines the merits of both approaches, which offers the optimal performance regarding controllability, switching device power losses and output harmonics. The main drawbacks of VZM, i.e. the increased switching loss and high-frequency harmonics due to additional switching transitions, has been minimized in the proposed scheme. The performance of the proposed scheme is evaluated through simulation and experiment.
Original languageEnglish
Pages (from-to)3865 - 3878
JournalIEEE Transactions on Industry Applications
Volume56
Issue number4
Early online date1 Apr 2020
DOIs
Publication statusPublished - 1 Aug 2020

Keywords

  • DC-AC power converters
  • three level converters
  • voltage balancing
  • Pulse Width Modulation

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